OSA Opto OLS-336BA460-X-TU

the angle at which a display can be viewed with acceptable visual performance.

the amount of voltage needed to get current to flow across a diode.

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.